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SCSI Enable/Disable
The SCSI Enable/Disable jumper at
JA4 allows you to enable or dis-
able the onboard SCSI. The nor-
mal (default) position is on pins 1-
2 to enable SCSI. See the table on
the right for jumper settings.
SCSI Termination Enable/
Disable
Jumpers JPA1 and JPA2 allow you
to enable or disable termination for
the SCSI connectors. Jumper JPA1
controls SCSI channel A and JPA2
is for SCSI channel B. The default
setting is open to enable (terminate)
both SCSI channels. See the table
on the right for jumper settings.
PCI-X Bus Speed Setting
Jumper P2 is used to change the
speed of the single PCI-X bus on
the motherboard. See the table on
the right for jumper settings.
Note: The PCI-X bus is also tied to
the SCSI controller. If using a 33/66
MHz PCI card in this slot, you will
slow the SCSI speed down to 33 or
66 MHz.
Front Side Bus Speed
JP12 is used to set the system
(front side) bus speed for the pro-
cessors.
It is best to keep this
jumper set to Auto. See the table
on the right for jumper settings.
Chapter 5: Advanced Motherboard Setup
SCSI Enable/Disable
Jumper Settings
(JA4)
Jumper
Position
Pins 1-2
Pins 2-3
SCSI Channel T ermination
Enable/Disable
Jumper Settings
(JPA1, JPA2)
Jumper
Position
Open
Closed
PCI-X Slot Bus Speed Settings
Pin
Setting
Pins 1-2
Pins 2-3
Pins 3-4
Pins 4-5
(*This slot was designed for
use with PCI-X cards - some
PCI cards may work in the
slot.)
5-23
Definition
Enabled
Disabled
Definition
Enabled
Disabled
Pin Definitions
(P2)
Speed
PCI 33/66 MHz
PCI-X 66 MHz
PCI-X 100 MHz
PCI-X 133 MHz
Front Side Bus Speed
Jumper Settings (JP12)
Jumper
Position
Definition
Pins 1-2
Auto
Pins 2-3
400 MHz
Open
533 Mhz
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